A358808 - OEIS

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A358808 - OEIS

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A358808

a(n) is the minimal permanent of an n X n symmetric matrix using all the integers from 0 to n*(n + 1)/2 - 1.

4

1, 0, 1, 33, 2425, 357046, 92052610

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OFFSET

0,4

LINKS

Table of n, a(n) for n=0..6.

EXAMPLE

a(2) = 1:

[0, 1;

1, 2]

a(3) = 33:

[0, 1, 2;

1, 3, 4;

2, 4, 5]

a(4) = 2425:

[0, 2, 3, 1;

2, 8, 7, 4;

3, 7, 9, 6;

1, 4, 6, 5]

CROSSREFS

Cf. A000217, A351153, A351610.

Cf. A358806 (minimal determinant), A358807 (maximal determinant), A358809 (maximal).

Sequence in context: A372903 A118641 A263908 * A111922 A136541 A263105

Adjacent sequences: A358805 A358806 A358807 * A358809 A358810 A358811

KEYWORD

nonn,hard,more

AUTHOR

Stefano Spezia, Dec 02 2022

EXTENSIONS

a(4) corrected and a(5)-a(6) from Hugo Pfoertner, Dec 07 2022

STATUS

approved